1221214005 has 48 divisors (see below), whose sum is σ = 2330887104. Its totient is φ = 586544640.

The previous prime is 1221213967. The next prime is 1221214009. The reversal of 1221214005 is 5004121221.

It is not a de Polignac number, because 1221214005 - 2⁶ = 1221213941 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221214009) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 41437 + ... + 64493.

It is an arithmetic number, because the mean of its divisors is an integer number (48560148).

Almost surely, 2^1221214005 is an apocalyptic number.

1221214005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1221214005 is a deficient number, since it is larger than the sum of its proper divisors (1109673099).

1221214005 is a wasteful number, since it uses less digits than its factorization.

1221214005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23186 (or 23183 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1221214005 is about 34945.8725030582. The cubic root of 1221214005 is about 1068.8840390006.

Adding to 1221214005 its reverse (5004121221), we get a palindrome (6225335226).

The spelling of 1221214005 in words is "one billion, two hundred twenty-one million, two hundred fourteen thousand, five".